A269187 Number of n X n 0..3 arrays with some element plus some horizontally, diagonally, antidiagonally or vertically adjacent neighbor totalling three no more than once.

4, 108, 9284, 2817548, 3159954052, 13377149358556, 217602949665911156, 13760950074226562086140, 3411379570274317633099847884, 3335382860394625859139269051079788

Offset: 1

Author

R. H. Hardin, Feb 20 2016

Keywords

• nonn

Comments

Diagonal of A269194.

Examples

			Some solutions for n=3
..0..0..0. .2..2..0. .0..1..0. .2..2..2. .3..3..3. .1..3..2. .0..1..3
..2..0..2. .3..2..0. .0..0..0. .0..0..2. .3..2..2. .1..1..3. .1..3..1
..3..2..0. .3..2..0. .0..0..1. .0..2..0. .0..2..3. .3..3..3. .1..3..3
		

Crossrefs

Cf. A269194.